Given f(x)=2x^2+ax+bf and knowing it has a local minimum at (2,-5); find the value of a and b
-b /2a = 2 where b = 'a' and a = 2
- a /4 = 2
a = -8
2x^2 -8x+b = -5 when x = 2
8 - 16 + b = -5
b = 3
+36916 
